<template>
  <div>
    <img :src="bg" class="wave"/>
    <div class="login-container">
      <!-- 预留位置 可以配置后台图片 -->
      <div></div>
      <div class="login">
        <h3 class="title">{{ title }}</h3>

        <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" v-if="currentPage === 0">
          <!-- 用户名 -->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" type="text" placeholder="账号" clearable>
              <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon"/>
            </el-input>
          </el-form-item>

          <!-- 密码 -->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" type="password" placeholder="密码" show-password clearable @keyup.enter.native="handleLogin">
              <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon"/>
            </el-input>
          </el-form-item>

          <!-- 图形验证码 -->
          <el-form-item prop="code" v-if="captchaEnabled">
            <el-input v-model="loginForm.code" placeholder="验证码" style="width: 63%" clearable @keyup.enter.native="handleLogin">
              <svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon"/>
            </el-input>

            <div class="login-code">
              <ReImageVerify ref="ReImageVerify" :code.sync="imgCode"/>
            </div>

          </el-form-item>

          <el-form-item>
            <div class="w-full flex justify-between items-center">
              <el-checkbox v-model="loginForm.rememberMe">记住密码</el-checkbox>
              <el-button type="text" @click="handleToUpdate" v-if="isShowForget">忘记密码?</el-button>
            </div>
          </el-form-item>


          <el-form-item style="width:100%;">
            <el-button :loading="loading" size="medium" type="primary" style="width:100%;" @click.native.prevent="handleLogin">
              <span v-if="!loading">登 录</span>
              <span v-else>登 录 中...</span>
            </el-button>
            <div style="float: right;" v-if="register">
              <el-button @click="currentPage = 3" type="text">立即注册</el-button>
            </div>
          </el-form-item>
        </el-form>

        <!-- 忘记密码 -->
        <update v-if="currentPage === 4"/>
        <!-- 注册 -->
        <register v-if="currentPage === 3"/>

      </div>
    </div>

  </div>
</template>

<script>
  import Cookies from 'js-cookie';
  import ReImageVerify from '@/components/ReImageVerify';
  import update from './components/update.vue';
  import register from './components/register.vue';
  import { encrypt, decrypt } from '@/utils/jsencrypt';
  import loginSettings from './utils/loginSettings';

  // 页面背景图
  import bg from '@/assets/login/bg.png';
  // 登录页面的title,可以在配置文件中设置
  import { title } from '@/config';

  export default {
    name: 'Login',
    components: {
      ReImageVerify,
      update,
      register
    },
    data() {
      const validatorCode = (rule, value, callback) => {
        if (this.imgCode !== value) {
          callback(new Error('请输入正确的验证码'));
        } else {
          callback();
        }
      };
      return {
        bg: bg,  // 背景
        title: title,// 管理后台标题
        imgCode: '', // 图片校验码
        loginForm: {
          username: 'admin',
          password: 'admin123',
          rememberMe: false,
          code: '',
          uuid: ''
        },
        loginRules: {
          username: [
            { required: true, trigger: 'blur', message: '请输入您的账号' }
          ],
          password: [
            { required: true, trigger: 'blur', message: '请输入您的密码' }
          ],
          code: [
            { required: true, trigger: 'change', message: '请输入验证码' },
            { required: true, validator: validatorCode, trigger: 'change' }
          ]
        },
        loading: false,
        // 验证码开关
        captchaEnabled: loginSettings.captchaEnabled,
        // 注册开关
        register: loginSettings.isShowRegister,
        // 忘记密码开关
        isShowForget: loginSettings.isShowForget,
        redirect: undefined,
        // 0:登录  3: 注册 4:忘记密码
        currentPage: 0
      };
    },
    watch: {
      $route: {
        handler: function (route) {
          this.redirect = route.query && route.query.redirect;
        },
        immediate: true
      },

      'imgCode': function (val) {
        console.log(val)
      }
    },
    created() {
      this.getCookie();
    },

    methods: {

      getCookie() {
        const username = Cookies.get('username');
        const password = Cookies.get('password');
        const rememberMe = Cookies.get('rememberMe')
        this.loginForm = {
          username: username === undefined ? this.loginForm.username : username,
          password: password === undefined ? this.loginForm.password : decrypt(password),
          rememberMe: rememberMe === undefined ? false : Boolean(rememberMe)
        };
      },

      // 忘记密码
      handleToUpdate() {
        this.currentPage = 4
      },


      handleLogin() {
        this.$refs.loginForm.validate(valid => {
          if (valid) {
            this.loading = true;
            if (this.loginForm.rememberMe) {
              Cookies.set('username', this.loginForm.username, { expires: 30 });
              Cookies.set('password', encrypt(this.loginForm.password), { expires: 30 });
              Cookies.set('rememberMe', this.loginForm.rememberMe, { expires: 30 });
            } else {
              Cookies.remove('username');
              Cookies.remove('password');
              Cookies.remove('rememberMe');
            }
            this.$store.dispatch('Login', this.loginForm).then(() => {
              this.$router.push({ path: this.redirect || '/' }).catch(() => {
              });
            }).catch(() => {
              this.loading = false;
              // 重新生成图片验证码
              if (this.captchaEnabled) {
                this.$refs.ReImageVerify.getImgCode();
              }
            });
          }
        });
      }
    }
  };
</script>

<style rel="stylesheet/scss" lang="scss">
  .wave {
    position: fixed;
    height: 100%;
    left: 0;
    bottom: 0;
    z-index: -1;
  }

  .login-container {
    width: 100vw;
    height: 100vh;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-gap: 18rem;
    padding: 0 2rem;
  }

  .login {
    display: flex;
    justify-content: center;
    flex-direction: column;
    height: 100%;
    width: 400px;
  }

  .title {
    margin: 0px auto 30px auto;
    text-align: center;
    color: #707070;
  }

  .login-form {
    border-radius: 6px;
    background: #ffffff;
    width: 400px;
    padding: 25px 25px 5px 25px;

    .el-input {
      height: 38px;

      input {
        height: 38px;
      }
    }

    .input-icon {
      height: 39px;
      width: 14px;
      margin-left: 2px;
    }
  }

  .login-tip {
    font-size: 13px;
    text-align: center;
    color: #bfbfbf;
  }

  .login-code {
    width: 33%;
    height: 38px;
    float: right;

    img {
      cursor: pointer;
      vertical-align: middle;
    }
  }
</style>
